Grill brush attachment having spiral bristles



FIG. 1 is a rear isometric view of a grill brush attachment having spiral bristles in accordance with the new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a side view thereof.

The elements shown in broken lines illustrate portions of the grill brush attachment that form no part of the claimed design. 

CLAIM The ornamental design for a grill brush attachment having spiral bristles, as shown and described. 